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The Join element is used by Activity and State Machine diagrams. The example illustrates a Join transition between Activities. With respect to State Machine diagrams, a Join pseudo-state indicates multiple States concurrently transitioning into the Join and onto a single State. Unlike Choice or Junction pseudo-states, Joins must not have triggers or guards. This diagram demonstrates a Fork pseudo-state dividing into two concurrent Regions, which then return to the End State via the Join.

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OMG UML Specification:

The OMG UML specification (UML Superstructure Specification, v2.1.1, p. 538) states:

Join vertices serve to merge several transitions emanating from source vertices in different orthogonal regions. The transitions entering a join vertex cannot have guards or triggers.